(OPEN
Radio
Access
Network) Open RAN (two words) or ORAN refers to creating standard open interfaces between cellular network hardware and software. OpenRAN (one word) may refer to either of two Telecom Infra Project groups: OpenRAN project group (2G/3G/4G) or OpenRAN 5G NR.
O-RAN (with a dash) refers to the O-RAN Alliance, which publishes open specifications and software for RANs. See
RAN.